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A487 New Dyfi Bridge

Event organised by ICE

21 March 2024
18:30 - 19:30 GMT
Add to Calendar 21-03-2024 18:30 21-03-2024 19:30 false Europe/London A487 New Dyfi Bridge Online,


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This scheme comprises a new 1.2km long single carriageway road starting at the northern edge of Machynlleth and traversing the Afon Dyfi floodplain on a 724m long elevated viaduct over the floodplain of the Afon Dyfi and the river itself.

The viaduct comprises 20 spans of steel and concrete construction supported by pairs of circular reinforced concrete columns on piled foundations. A 400-metre length of steel girder viaduct complete with precast bridge deck units was “push" launched over the flood plain.

The Welsh Government awarded Griffiths the Early Contractor Involvement contract for the A487 New Dyfi Bridge scheme in June 2015. The Griffiths team included Arup as the designer. 

In January 2020 the scheme was given the go ahead by Welsh Government. Detailed design commenced in March 2020 followed by the construction phase in May 2021.

A brief introduction of the A487 New Dyfi Bridge scheme will be shared by a representative from the client, the Welsh Government.

A representative from the designer, Arup, will explain the design principles and some of the challenges they came across associated with the works.

A representative from Griffiths will explain how the works were planned to minimise working in the floodplain and avoiding potential environmental issues. The contractor will share the construction challenges and complexities that have been experienced. 


Peris Jones

Peris Jones

Llywodraeth Cymru, Welsh Government

head of capital delivery

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Peris Jones

Peris is Chartered Civil Engineer and Fellow of the ICE and CIHT and has worked in various sectors of the civil engineering industry including renewable energy, marine, flood defence, water, and transport. He’s been delivering a variety of schemes for a contractor, consultants, and the last 17 years with the Welsh Government.

As the Head of Capital Delivery, Peris is responsible for leading teams to deliver major projects and maintenance schemes on the strategic road network in Wales. Peris’ involvement on this project began during the preliminary design and statutory process before delivering two advanced work packages and then the main construction works.